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Method for preparing rare earth oxide doped tungsten and molybdenum spherical powder for 3D printing

A technology of rare earth oxide and spherical powder, which is applied in the preparation of molybdenum powder and the field of doping tungsten with rare earth oxide for 3D printing. The effect of excellent degree and fluidity

Pending Publication Date: 2020-01-24
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In short, the rare earth oxide doped tungsten and molybdenum powders prepared by traditional methods are difficult to meet the requirements of 3D printing technology in terms of particle size and morphology. Powder technology is imminent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Using ammonium metatungstate, ammonium nitrate, glycine and lanthanum nitrate as raw materials, tungsten oxide / lanthanum oxide composite powder was prepared by low-temperature solution combustion synthesis method, and then the prepared powder was reduced with hydrogen to obtain La 2 o 3 Doped nano tungsten powder, the particle size of tungsten powder is 35nm. Using a high-speed centrifugal dryer, the prepared La 2 o 3 Doping nano-tungsten powder for granulation, and then using an atmosphere furnace to calcine the granulated powder in a hydrogen atmosphere to obtain spherical tungsten powder that can be used for 3D printing. 1h, then rise to 1150°C at 10°C / min, keep warm for 3h, then cool down with the furnace, the hydrogen flow rate is 1L / min. The prepared spherical tungsten powder has an average particle size of 25 μm, La 2 o 3 The doping amount is 1 wt%.

Embodiment 2

[0016] Using ammonium molybdate, ammonium nitrate, urea and lanthanum nitrate as raw materials, molybdenum oxide / lanthanum oxide composite powder was prepared by low-temperature solution combustion synthesis method, and then the prepared powder was reduced with hydrogen to obtain La 2 o 3 Doped nano molybdenum powder. Using a high-speed centrifugal dryer, the prepared La 2 o 3 Doping nano-molybdenum powder for granulation, and then using a tube furnace to calcine the granulated powder in a hydrogen atmosphere to obtain spherical molybdenum powder that can be used for 3D printing. The calcination process is: from room temperature to 550 °C at 5 °C / min Keep warm for 0.5h, then rise to 1000°C at 8°C / min, keep warm for 2h, then cool down with the furnace, the hydrogen flow rate is 0.8L / min. The prepared spherical molybdenum powder has an average particle size of 30 μm, La 2 o 3 The doping amount is 1 wt%.

Embodiment 3

[0018] Using ammonium molybdate, ammonium nitrate, glycine and yttrium nitrate as raw materials, molybdenum oxide / yttrium oxide composite powder was prepared by low-temperature solution combustion synthesis method, and then the prepared powder was reduced with hydrogen to obtain Y 2 o 3 Doped nano molybdenum powder. Use a high-speed centrifugal dryer to prepare the Y 2 o 3 Doping nano-molybdenum powder for granulation, and then using a tube furnace to calcine the granulated powder in a hydrogen atmosphere to obtain spherical molybdenum powder that can be used for 3D printing. The calcination process is: from room temperature to 500°C at 6°C / min Keep warm for 1h, then raise to 1100°C at 8°C / min, keep warm for 2h, then cool down with the furnace, the hydrogen flow rate is 0.8L / min. The average particle size of the prepared spherical molybdenum powder is 28 μm, Y 2 o 3 The doping amount is 1.5 wt%.

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Abstract

The invention provides a method for preparing rare earth oxide doped tungsten and molybdenum spherical powder for 3D printing, and belongs to the technical field of powder metallurgy powder preparing.According to the specific preparing method, a low-temperature solution combustion synthesizing method is adopted for preparing rare earth oxide / tungsten oxide (molybdenum oxide) composite powder, then, hydrogen reduction is conducted to obtain rare earth oxide doped nano tungsten (molybdenum) powder, then, atomizing granulation equipment is used for granulating nano powder, and after the nano powder is roasted, ground and screened, the spherical tungsten (molybdenum) powder for 3D printing can be obtained. Raw materials are simple and easy to obtain, the equipment is simple, the technology israpid, a large number of products can be prepared within the short time, and the method is suitable for large-scale production. The rare earth oxide in the prepared tungsten and molybdenum sphericalpowder can be evenly scattered, particles are fine, oxide particle segregation cannot happen, and the rare earth oxide adding amount can be adjusted through the low-temperature solution combustion synthesizing process. The prepared tungsten and molybdenum spherical powder is excellent in sphericity degree and mobility and is extremely suitable for the 3D printing technology.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy powder preparation, and relates to a preparation method of powder for 3D printing, in particular to a preparation method of rare earth oxide doped tungsten and molybdenum powder for 3D printing. Background technique [0002] 3D printing technology, also known as additive manufacturing technology, is a technology based on the principle of discrete / accumulation, through the gradual accumulation of materials to achieve manufacturing. It uses computer technology to cut the 3D model of the parts that need to be formed into a series of thin slices of a certain thickness, and then uses 3D printing equipment to manufacture each layer of thin slices from bottom to top, and finally superimposes to form three-dimensional solid parts. This manufacturing technology does not require traditional tools or molds, can realize parts with complex structures that are difficult or impossible to process with t...

Claims

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Application Information

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IPC IPC(8): B22F9/22B22F1/00C22C27/04B33Y70/10
CPCB22F9/22C22C27/04B33Y70/00B22F1/065
Inventor 秦明礼杨军军章雨峰陈铮陈鹏起鲁慧峰贾宝瑞曲选辉
Owner UNIV OF SCI & TECH BEIJING
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